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Organic Chemistry Some Basic Principles and Techniques — NEET Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

Which experiment decisively weakened the vital-force theory of organic compounds?
  1. Wöhler synthesised urea from ammonium cyanate ✓
  2. Lavoisier burned carbon compounds in oxygen
  3. Kekulé proposed a ring structure for benzene
  4. Berzelius separated compounds from living tissue
Answer: A. Wöhler's laboratory conversion of inorganic ammonium cyanate into urea showed that an organic compound need not arise from a living organism. That directly attacked vitalism.
Why not B: Combustion analysis established composition but did not make an organic compound from an inorganic source.
Why not C: The benzene proposal concerned structure, not the claimed need for a life force.
Why not D: Berzelius supported the vital-force distinction rather than disproving it.
Which order describes simple alkyl-carbocation stability?
  1. CH3+ > 1° > 2° > 3°
  2. 1° > 2° > 3° > CH3+
  3. 3° > 2° > 1° > CH3+ ✓
  4. 2° > 3° > 1° > CH3+
Answer: C. Alkyl groups stabilise positive carbon through +I effect and hyperconjugation, so more substitution gives 3° > 2° > 1° > methyl. Applying steric crowding here gives the wrong intuition.
Why not A: This reverses stabilisation by alkyl substitution and hyperconjugation.
Why not B: This recognises methyl as least stable but reverses the order among substituted cations.
Why not D: A tertiary cation has more donating alkyl groups and hyperconjugative structures than a secondary one.
What is the correct IUPAC name of CH3CH(CH3)CH2CH(OH)CH3?
  1. 4-methylpentan-2-ol ✓
  2. 2-methylpentan-4-ol
  3. 1,3-dimethylbutan-1-ol
  4. 4-methylpentan-4-ol
Answer: A. The longest OH-containing chain has five carbons and is numbered from the OH end, giving OH at 2 and methyl at 4: 4-methylpentan-2-ol. Suffix priority controls direction.
Why not B: This numbers from the end nearer the methyl branch and gives the suffix OH the higher locant 4.
Why not C: Choosing a four-carbon parent ignores the longest chain containing the OH carbon.
Why not D: It assigns the OH locant from the methyl position rather than the actual structure.

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Questions

How many NEET questions are there on Organic Chemistry Some Basic Principles and Techniques?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.